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the rulebook says that ...
rulebook 作主语时，后接 that 从句说明规则内容。
The rulebook says that players must wear helmets.
规则手册规定，选手必须戴头盔。
规则手册；规则汇编
先理解核心含义，再看它在真实句子里的用法。
规则手册；规则汇编
a book or set of rules that must be followed
The rulebook says that players must wear helmets.
规则手册规定，选手必须戴头盔。
规则手册；载有规则的书。
A book containing a set of rules.
The club updated its rulebook to include the new attendance policy.
俱乐部更新了规则手册，加入了新的出勤政策。
If you are not sure about the scoring rules, look them up in the rulebook.
如果你不确定计分规则，可以在规则手册里查一下。
The referee carries a rulebook and checks it whenever there is a dispute.
裁判随身带着一本规则手册，遇到争议时就查一查。
rulebook 作主语时，后接 that 从句说明规则内容。
The rulebook says that players must wear helmets.
规则手册规定，选手必须戴头盔。
according to the rulebook 作状语，表示“根据手册规定”。
According to the rulebook, the game lasts 90 minutes.
根据规则手册，比赛持续90分钟。
be in the rulebook 表示信息或规定包含在规则手册中。
The answer is in the rulebook.
答案就在规则手册里。
rulebook 是可数名词（复数 rulebooks），后可接 for 说明适用对象。
She wrote a rulebook for new employees.
她为新员工写了一本规则手册。
Not this
According to rulebook, you must finish the test in one hour.
Use this
According to the rulebook, you must finish the test in one hour.
rulebook 是可数名词单数，前面需要加冠词 the；中文没有冠词，学习者容易漏掉，所以要用 the rulebook。
Not this
The teacher handed out two rulebook for the course.
Use this
The teacher handed out two rulebooks for the course.
rulebook 是可数名词，表示两本或以上规则手册时要用复数形式 rulebooks，不能保留单数 rulebook。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
遵守规则手册
New employees are expected to follow the rulebook at all times.
新员工应始终遵守规则手册。
按照规则手册
According to the rulebook, you must submit the form before the deadline.
按照规则手册，你必须在截止日期前提交表格。
规则手册上规定
The rulebook says players cannot touch the ball with their hands.
规则手册上规定，球员不得用手触球。
变通规则
The manager bent the rulebook to approve the urgent request.
经理变通规则，批准了紧急请求。
改写规则；改变游戏规则
This technology has rewritten the rulebook for communication.
这项技术改写了通信的规则。
对某人从严处理；严加处罚
The official threw the rulebook at the driver for the serious violation.
官员因这起严重违规而严惩了司机。
按规则；循规蹈矩
He does everything by the rulebook.
他做每件事都按规矩来。
对某人从严处罚；把规章条例全用在某人身上
The referee threw the rulebook at the player for the dangerous tackle.
裁判因那次危险铲球对这名球员从严处罚。
打破常规；抛弃旧规章
The new manager tore up the rulebook and let the team experiment.
新任经理打破了常规，让团队自由尝试。
Use rulebook naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 rule（规则）和 book（书）拼在一起：一本专门写规则的书，就是规则手册。
语域：neutral 常见场景：sports、corporate rules、government regulations rulebook 通常指正式写成的规则手册，多用于体育、公司或政府部门等强调明文规定的场合；在日常对话中也能见到，语气比较中性。
这些词都含 -ook 拼写，读 /ʊk/。其中 book、textbook、notebook、handbook 与 rulebook 一样，都以 /bʊk/ 收尾，发音一致。look、cook 则是 /ʊk/ 开头少了 /b/。注意不要见到 oo 就读 /uː/：food /fuːd/、moon /muːn/ 的 oo 发长音，而 book 等发短音 /ʊ/。
Dictionary facts from ECDICT, WIKTIONARY.